Overflow Waste
Overflow waste pipe carries the discharge from a cistern, basin or tank out through the wall, so a failed valve shows outside instead of flooding a floor. Overflow pipe comes in 21.5mm at 3m with bends, tees, straight connectors and wall flanges. Connects to push fit waste.
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Choosing Overflow Waste
Frequently Asked Questions
32mm is for a hand basin. 40mm covers a sink, bath, shower, washing machine and dishwasher — anything discharging a larger volume. If in doubt, 40mm. Running a basin in 40mm is not a problem; running a bath in 32mm is, and it shows up as slow draining and gurgling.
A P trap where the waste runs horizontally into the wall, a bottle trap where it drops and space behind the basin is tight, and a shallow trap under a bath or shower tray where there is very little height. Telescopic versions take up the difference in a cupboard where the pipe centre does not line up.
Push fit seals on a ring, so a run can be dismantled and reused and there is no curing time — useful for a repair, or anywhere access stays open. Solvent weld is cemented rigid at every joint, which suits a stack that will be boxed in or a run sealed behind plasterboard, where a creeping seal is a real problem.